Image and Signal Processing Methods

Spatial resolution analysis of low frequency ultrawidebeam–ultrawideband synthetic aperture radar based on wavenumber domain support of echo data

[+] Author Affiliations
Hongtu Xie

Air Force Early Warning Academy, Department of Air/Space-Based Early-Warning Equipment, Wuhan, Hubei 430019, China

National University of Defense Technology, College of Electronic Science and Engineering, Changsha, Hunan 410073, China

Daoxiang An, Xiaotao Huang, Zhimin Zhou

National University of Defense Technology, College of Electronic Science and Engineering, Changsha, Hunan 410073, China

J. Appl. Remote Sens. 9(1), 095033 (Dec 30, 2015). doi:10.1117/1.JRS.9.095033
History: Received June 2, 2015; Accepted November 30, 2015
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Abstract.  Compared with the traditional narrowbeam–narrowband (NB) synthetic aperture radar (SAR), the large fractional signal bandwidth and wide azimuth beamwidth of the low frequency (LF) ultrawidebeam–ultrawideband (UWB) SAR induce serious coupling between the azimuth and range wave numbers of the echo data, which might influence the behavior of the spatial resolution in the SAR imaging. The spatial resolution considering the system wave number coupling and radar squint angle for the LF UWB SAR system is proposed based on the wave number domain support (WDS) of the echo data. First, the SAR imaging geometry is built and then the spatial wave number of the echo data for the LF UWB SAR is analyzed. Second, based on the WDS of the echo data, the spatial resolution of the LF UWB SAR is derived. Moreover, the narrowing/broadening factor defined as the ratio of the proposed spatial resolution to the traditional spatial resolution is presented, which indicates the effects of the fractional bandwidth and associated integration angle as well as the squint angle on the spatial resolution. Finally, simulation results are given to prove the correctness of the theory analysis and validity of the proposed spatial resolution.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Hongtu Xie ; Daoxiang An ; Xiaotao Huang and Zhimin Zhou
"Spatial resolution analysis of low frequency ultrawidebeam–ultrawideband synthetic aperture radar based on wavenumber domain support of echo data", J. Appl. Remote Sens. 9(1), 095033 (Dec 30, 2015). ; http://dx.doi.org/10.1117/1.JRS.9.095033


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